×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

WP11 hardness

WP11 hardness

WP11 hardness

(OP)
Hi
In portable hardness test of a 28 inch WP11 tee we had some problem. As standards mentioned, before testing we should remove all oxides ,paint,.....
We prepare surface with a grinder till we visually see bright mirror like surface. The result of hardness test was 215 brinnel. We checked the thickness. By our first preparation ,the thickness decreased 0.1mm. I suggested to grind 0.1mm more and the results became within the range of standard ,about 170 brinnel.
Are we allowed to do the above mentioned process according to astm standards.
Thanks

RE: WP11 hardness

Are you the manufacturer or the Buyer? If you are the Buyer, the hardness testing is up to you.
As I remember, there was no hardness test requirement for WP11 but I may well be wrong. Do read the ASTM specification for the grade.

RE: WP11 hardness

(OP)
Dear weldstan
We are the buyer. But some of my friends believe that by grinding 0.1mm more from the surface would alter the real surface hardness and that may cause failure from the surface(which have the higher hardness) in the future. You were right about the hardness requirements for wp11 .But as I said ,the tee was 28 inch and we couldn't do destructive tests. So we just performed PIM and surface hardness measurement.
Thanks

RE: WP11 hardness

A small spot ground and polished will not affect the overall strength of your Tee. Your hardness test should only be done to validate the manufacturer's MTR for the part. Because the minimum tensile strength of WP11 is so low and most WP11 will be much stronger than the minimum tensile properties mandated (essentially for fully annealed heat treatment), I would not require hardness testing of the material, only PMI to confirm chemistry.

RE: WP11 hardness

(OP)
Dear weldstan
But as you know according to SA234-wp11 there's limitation on maximum hardness. Maximum hardness is 201 HB.
Thnks

RE: WP11 hardness

With a max hardness requirement, the hardness should be stated on the MTR. As a receiving inspection by the Buyer, I would still only recommend a PMI. A tellebrinneler test on a filed surface would negate some of the surface effects that influence your test equipment (assumed sonodur type - MIC 10 or equivalent).

RE: WP11 hardness

(OP)
Dear weldstan
I agree with you about the problems of portable hardness testers. But when you don't have MTR or when you don't receive MTR ontime, what do you recommend? In this case we couldn't do destructive tests. So if you just do PMI,how would you assure about the mechanical properties?
Thanks

RE: WP11 hardness

If you don't have the MTR, then I would advise both PMI and hardness testing as a receiving inspection prior to installing.

One must ask, why was the Tee purchased without an MTR supplied at receipt?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close